[Insight-users] LoG in ITK (

[Joshua Cates]

Hi Kai,

The ITK discrete GaussianOperator implementation was based on a
formulation described by Tony Lindeberg, whose discrete smoothing kernels
were designed to commute with finite difference operations.  In other
words, you should be able to use the DiscreteGaussian and Laplacian in
sequence.  For references see the itk SoftwareGuide and the online manual
pages in www.itk.org.

hope this helps,

Josh.


______________________________
 Josh Cates			
 Scientific Computing and Imaging Institute
 University of Utah
 http://www.sci.utah.edu/~cates


On Tue, 6 Jul 2004, Kai Li wrote:

> 
> Hi,
>   I have a question about the calculating Laplacian-Of-Gaussian in ITK.
> I know I can use LaplacianRecursiveGaussianImageFilter to compute the
> Laplacian-Of-Gaussian. I also found there are such classes as
> GaussianOperator( used to implement DiscreteGaussianImageFilter) and
> LaplacianOperator( used to implement LaplacianImageFilter).
> What I'd like to ask is whether the following two ways of computing
> Laplacian-Of-Gaussian are equivament:
> 
> 1) Use LaplacianRecursiveGaussianImageFilter( with sigma = S).
> 2) Use GaussianOperator(with variance = S^2) followed by
> LaplacianOperator.
> 
> Also, is there a Laplacian-Of-Gaussian operator in ITK? If not, how hard
> is it to implement one?
> 
> Thanks,
> Kai
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